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(No Modelj) 2 Sheets- Sheet 2.

. H. K. GREENLEAP. '.IH'VAWING MACHINE OR DEVICE FOR PRODUGING HOT AIR BLASTS. 110.601,13).

Patentedv Mar. 22, 1898.

vIO

l` UNITED" STATES PATENT OFFICE.

HARRY KNOX GREENLEAF, OF PORTLAND, OREGON, ASSIGNOR OF TWO- THIRDS TOOHARLES E. POTTER AND JOHN O. vHOLLISTER, OF SAME PLACE.

THAWINGl-MACHINF 0R DEVICE FOR PRDUCING HOI-AIR BLASTS.

SPECIFICATION forming part of Letters Patent No. 601,135, dated March 22, 1898. Application filed September 13, 1897. Serial No. 651,541. (No model.)

To all whom it may concern.-

Be it known that I, HARRY KNox GREEN- LEAF, a citizen of the United States, residing at Portland, in the county of Multnomah and State of Oregon, have invented a new and useful Improvement in Thawing-Machines orDevices for Producing Hot-Air Blasts, of which the following is a specication, reference being had to the accompanying drawings as forming a part thereof. l

My invention relates generally to means for heating by the use of hot air, yet it is more especially directed toward placer-mining in a cold country.

The object of my invention is to produce a contrivance whereby yhot air, artificially generated, can be thrown in the form of a blast wherever wanted; and, as already stated, the principal object which I have in view at this time is to assist the miner in a cold countrylto continue his work to a considerable extent notwithstanding intense cold and frozen ground. For this purpose I have constructed a mechanism as illustrated in the said accompanying drawings, inl which-f Figure l is a front elevation of my invention, some of the interior parts being shown in broken lines. Fig. 2 is a partial longitudinal verticall section taken Vabout through the center of Fig. l. Fig. 3 is a partial rear end elevation, this ligure more particularly showin g the fan and mechanism for operating the same and the means for delivering the hot-air blast where wanted, such means being partially shown in a centrally-taken vertical section. Fig. 4 is a partial plan section taken aboutcentrally through the fan and its casing, this View more particularly showing the bearings supporting the spindle of the fan and its cooperating gear-wheel.

Referring now to the letters and numbers as designating the parts of my invention, my invention comprises a small furnace a, cast of iron and of any suitable construction, inclosed in a hood of sheet-iron l), which is supported over the furnace by means of a series of arms c c', extending around the furnace on three sides and consisting of a bolt c2, provided with threaded end and nut c3, and a short end of tube c4, as illustrated in the drawings, the space between the exterior of the furnace and hood constituting a hot-air chamber.

Part of the front of the hoodbis cut away to give access yto the furnace, such front being fastened to the furnace by means of a series of bolts d, as illustrated in Fig. 1.

The flue-pipe e extends from the furnace through the hood, the upper end being supported by a collar f, fixed to and projecting from the hood. To the rear end of the hood I attach a casing g to contain a fan h. To provide bearings for the spindle h of such fan and the gear-wheel, I use four vertical bars or supports t i', two on each side, which are fastened to the exterior of the hood b by means of the bolts of the arms c c. Two bars j j', one on each side, extend horizontally across and are bolted to the supports 1li', and a pair of shorter bars la 7c' extend horizontally between and are bolted tothe said bars jj', (see Fig. 4,) the bars la la being suitably perforated tov receive the reduced ends of the spindle of thefan and the gear-wheel. The end of the fan-spindle projecting out of the head of the fan -casing is provided with a small gear-wheel Z, which meshes with the larger gear fm., on the face of which is a handle fn, so as to be able to rotate the fan by turning such larger gear-wheel. The fancase is provided with a spout o, over the discharge end of which I aflix a short length of pipe and fasten over the discharge end of the latter a length of iiexible tubing q, so that the'blast of hot air may be discharged in any direction. The iiexible tube may consist of canvas or any other suitable material coveringV a coil of wire, and the tube may be secured in place over the end of the pipe p by making said pipe end slightly flaring and using a clamp like r, and the discharge end of said flexible tube may be provided with a series of perforations, (see Fig. 1,) so that the hot air may be caused to issue in jets from the circumference of said tube when such would be an advantage, as in working in an the fan the hot air is impelled forward through the spout of the fan-casing and the tube q, and may then be utilized as wanted, the air IOO and on the rear end of the hood, a fan within the fan-easing having its shaft journaled in said transverse bars, and means for rotating 15 the said fan.

In witness whereof I have hereunto set my hand, in the presence of two witnesses, this 26th day of August, 1807.

HARRY KNOX GREENLEAF.

In presence of- E. S. SEAMAN, GEO. W. IIAZEN. 

